Voltage Drop Calculations
In 2008, I have written some articles on voltage drop calculations as a tool in the selection of the correct cable sizes. Voltage Drop Calculation; Voltage Drop Calculation Part 2; …
Earth Fault Higher Than Three Phase Fault
In a power system, almost always three phase fault current is higher than the earth-fault current. However, earth fault current near the generator is higher than three phase fault. What …
Negative Sequence Currents – Causes, Effects and Protection
What is a Negative Sequence Current? Negative sequence current is defined as a type of unbalanced current that occurs in a three-phase electrical system. In a balanced three-phase system, the …
Ventilation Requirements for Stationary Battery Rooms
Almost always, stationary battery rooms ventilation is an argument among engineers. However, seldom do their reasoning are based on scientific evidence to prove their position. IEC std 62485 provides a …
IEEE C57.12.00 – Preferred Continuous kVA Ratings of Transformers
The rated kVA of a transformer shall be the output that can be delivered for the time specified at rated secondary voltage and rated frequency without exceeding the specified temperature-rise …
Complex MVA Method Short Circuit Calculation
I. Introduction This post will present the methodology of MVA Method in performing short circuit calculation. The result will be compared to the Impedance Method of Short-Circuit Calculation and the …